diff --git a/lib/concurrent-ruby/concurrent/async.rb b/lib/concurrent-ruby/concurrent/async.rb
index 5e125e4a0..e7329dad4 100644
--- a/lib/concurrent-ruby/concurrent/async.rb
+++ b/lib/concurrent-ruby/concurrent/async.rb
@@ -267,10 +267,18 @@ def self.included(base)
 
     # @!visibility private
     module ClassMethods
-      def new(*args, &block)
-        obj = original_new(*args, &block)
-        obj.send(:init_synchronization)
-        obj
+      if RUBY_VERSION >= "2.7.0"
+        def new(*args, **kwargs, &block)
+          obj = original_new(*args, **kwargs, &block)
+          obj.send(:init_synchronization)
+          obj
+        end
+      else
+        def new(*args, &block)
+          obj = original_new(*args, &block)
+          obj.send(:init_synchronization)
+          obj
+        end
       end
     end
     private_constant :ClassMethods